ABSTRACT
Toxicological evidence is an important clue for confirmation of poisoning and deciding if it is a homicidal, suicidal, or accidental case. The samples sent for chemical analysis, collected by a crime scene investigator, in the form of vial or tablet or in the form of vomitous substances are sent to a forensic medicine expert/forensic pathologist during an autopsy. The toxicological samples should be appropriately recognized, preserved, packed, and marked before sending to the forensic science laboratory. All samples relating to a case should be gathered, packed independently, and sealed before sending to the laboratory. Seals are utilized to follow all proof for each case. Like some other proofs, the chain of custody should be protected consistently, from the morgue through the research facility testing, detailing, and capacity, for court purposes. If the progression of proof is undermined, it can bring about the case being excused in court.
